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Question: What do you mean by Glide Reflection ?

Answer:

A Glide reflection is a transformation involving a translation and a reflection in a line parallel to the translation. Some strip patterns (on belts or wallpaper borders) are based on glide reflections.

A glide reflection is a type of isometry of the Euclidean plane: the combination of a reflection in a line and a translation along that line. Reversing the order of combining gives the same result. The combination of a reflection in a line and a translation in a perpendicular direction is a reflection in a parallel line.